Backlight module and display device

Abstract

The present invention provides a backlight module and a display device. The backlight module comprises a light source and a backplate comprising a baseplate and a side plate surrounding edges of the baseplate, wherein the light source is provided on the side plate, the baseplate is formed by jointing a plurality of sub-baseplates with different heat conductivities together, and the plurality of sub-baseplates can allow heat generated by the light source to be circulated and led out. In the backlight module provided by the present invention, by jointing a plurality of sub-baseplates with different heat conductivities together to form the baseplate, heat generated by the light source can be circulated and conducted along the sub-baseplates with different heat conductivities, which greatly accelerates heat conduction in the baseplate, may cause the overall temperature of the baseplate to be lowered rapidly and be more uniform, and avoids appearance of wrinkles in film layer with smaller thickness in the backlight module. With the above backlight module, the display device becomes lighter and thinner, and can also ensure good display luminance and display quality.

The invention claimed is: 
     
       1. A backlight module, comprising a light source and a backplate which comprises a baseplate and a side plate surrounding edges of the baseplate, wherein the light source is provided on the side plate, and the baseplate is formed by jointing a plurality of sub-baseplates with different heat conductivities together, so that heat generated by radiation of the light source is circulated and led out. 
     
     
       2. The backlight module of  claim 1 , wherein the plurality of sub-baseplates are made of different materials, and are sequentially jointed together in order of heat conductivity of the materials. 
     
     
       3. The backlight module of  claim 2 , wherein each of the plurality of sub-baseplates is a small wedge, and the baseplate is a large wedge formed by the plurality of sub-baseplates; the thicknesses of the plurality of sub-baseplates are increased linearly, and the sub-baseplate with the highest heat conductivity has the smallest overall thickness. 
     
     
       4. The backlight module of  claim 3 , wherein the small wedge is a straight wedge, and a contacting surface through which two adjoining sub-baseplates are jointed together includes a plane. 
     
     
       5. The backlight module of  claim 3 , wherein the small wedge is a curved wedge, and a contacting surface through which two adjoining sub-baseplate are jointed together includes two planes with an included angle θ, θ is the smaller one of the included angles formed between the two planes, wherein 0°<θ<180°, and an opening of the included angle θ faces the sub-baseplate with lower heat conductivity. 
     
     
       6. The backlight module of  claim 4 , wherein in descending order of heat conductivity, cross sectional areas of the plurality of sub-baseplates perpendicular to a thickness direction of the plurality of sub-baseplates are sequentially increased. 
     
     
       7. The backlight module of  claim 6 , wherein the plurality of sub-baseplates are jointed together by welding. 
     
     
       8. The backlight module of  claim 7 , further comprising a housing encasing the backplate, wherein a first opening is provided at a side of the housing corresponding to the sub-baseplate with the lowest heat conductivity, and a second opening is provided at a side of the housing corresponding to the sub-baseplate with the highest heat conductivity. 
     
     
       9. The backlight module of  claim 8 , wherein the light source is provided on the side plate at the side of the sub-baseplate with the highest heat conductivity, and light-emitting surface of the light source faces the baseplate. 
     
     
       10. The backlight module of  claim 9 , further comprising a diffuser plate provided above the baseplate, wherein the diffuser plate has the same shape as the baseplate, and an upper surface of the diffuser plate is parallel to a lower surface of the baseplate. 
     
     
       11. A display device, comprising the backlight module of  claim 1 .